Abstract
It is observed that Ag(I) catalyzes the rate of substitution of phenylhydrazine (PhNHNH2) into hexacyanoferrate(II), producing a cherry red colored complex, [Fe(CN)5PhNHNH2]3−. The reaction was monitored at 488 nm leading to the formation of the complex under the conditions: [Fe(CN)6]4− (5.0 × 10−3 mol dm−3), PhNHNH2 (2.0 × 10−3 mol dm−3), temperature (25 ± 0.1 °C), pH (2.8 ± 0.02), and ionic strength, I (0.02 mol dm−3), (KNO3). Under optimum conditions, absorbance at fixed times (A t ) is linearly related to Ag(I) in the concentration range 10.79–97.08 ng cm−3, in the presence of several diverse ions. The highest percentage error and relative standard deviations in the entire range of Ag(I) determination are found to be 2.5% and 0.16, with a detection limit of 8.75 ng cm−3 of silver(I). The experimental accuracies expressed in terms of percentage recoveries are in the range of 97.87–102.50. The method was successfully applied for the determination of Ag(I) in a few synthetic samples and found to be in good agreement with those obtained from atomic absorption spectrophotometry (AAS). The validity of the proposed method has also been tested for Ag(I) determination in spiked drinking water samples. The present catalytic kinetic method (CKM) is highly sensitive, selective, reproducible, and inexpensive. A review of recently published catalytic spectrophotometric methods for determination of Ag(I) has also been presented for comparison.
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Abbreviations
- AAS:
-
Atomic absorption spectrophotometry
- BPT:
-
4,7-biphenyl-1,10-phenanthroline
- CKM:
-
Catalytic kinetic method
- DRD:
-
Dynamic range of detection
- DTPA:
-
Diethylenetriaminepentaacetic acid
- EDTA:
-
Ethylenediaminetetraacetic acid
- HEDTA:
-
N-(2-hydroxyethyl)ethylenediaminetriacetic acid
- HMBPTS:
-
2-hydroxy-4-methoxybenzophenonethiosemicarbazide
- IDA:
-
Imino-diacetic acid
- NTA:
-
Nitrilotriacetic acid
- PhNHNH2 :
-
Phenylhydrazine
- RSD:
-
Relative standard deviation
- SMs:
-
Synthetic mixtures
- SPM:
-
Spectrophotometric method
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Acknowledgment
The corresponding author, Dr. R. M. Naik is grateful to Council of Scientific Industrial Research (CSIR), New Delhi, India for providing financial assistance to perform this work.
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Naik, R.M., Tiwari, R.K., Singh, P.K. et al. Kinetic determination of silver at trace level based on its catalytic effect on a ligand substitution reaction. Transition Met Chem 33, 615–623 (2008). https://doi.org/10.1007/s11243-008-9088-5
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DOI: https://doi.org/10.1007/s11243-008-9088-5